Structure of bis(tetraphenylarsonium) hexamolybdate(VI)

The crystallisation of polyoxo-molybdate and -tungstate anions with phenylated phosphonium and arsonium cations, in relation to the crystal packing and species in solution

“…The crystal structure of this compound, crystallised from an unspecified solvent system which probably contained water, has already been reported (BIYPEE in the CSD). 15 There are some similarities with the structure of (Ph 4 P) 2 [W 6 O 19 ](DMSO) 2 , in that there is two-dimensional segregation of homo-charged ions, with layers of cations containing 6PE motifs separating layers of anions. However the higher pseudo-symmetry of (Ph 4 P) 2 [W 6 O 19 ](DMSO) 2 is broken, and the occurrence of two formula units in the asymmetric unit suggests less favourable packing.…”

Electrospray mass spectral study of isopolyoxomolybdates

“…In contrast, the discrete [Mo 2 O 7 ] 2Ϫ anion consists of two corner-shared MoO 4 tetrahedra, 27 29 but in this case the building block of the structure is formed from six distorted MoO 6 octahedra that are condensed so that all share a common vertex. 30 ] 8Ϫ anion has also been structurally characterized, 32 and consists of two octadecamolybdate (18-molybdate) sub-units related to each other by a center of inversion. The structure involves both six-and seven-co-ordinated molybdenum atoms, while the co-ordinated water molecules are bound directly to the molybdenum atoms in both terminal and bridging locations.…”

Structure of hydronium–1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown 6)–hexamolybdate(VI) (2/2/1)

“…The data set was taken for one twin, with 47 reflections omitted for which there are good reasons (mainly shapes of the reflections) to believe that they are subject to interference from the other twin: these include all 0k0, 0kl, and lkl, plus five others with low h and L Intensity errors resulting from twin interference elsewhere in the reciprocal lattice are not excluded and may contribute significantly to the R index and goodness of fit. The final parameters are listed in Table 1 (Clegg, Sheldrick, Garner & Walton, 1982). The 18-crown-6 ether ( Table 2, Fig.…”